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#12597 - 02/27/18 09:01 PM Re: .224 Valkyrie [Re: Niles Coyote]
Cinch Offline
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Registered: 07/09/11
Posts: 1277
Loc: Wyoming
Any idea what the bullet is? And powder?

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#12598 - 02/28/18 04:25 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
18" Rock Creek arrived from Rainier Arms. This barrel has a rifle +1" gas system with a port size around .095". I got it installed on a BCM upper and used a Sentry 7 adjustable gas block. Opened it to click number 7 and started velocity testing.

75gr Federal AE
2855,2870,2875=2866 10/20

90gr FGMM
2605,2598,2565,2596,2602=2593 16/40 minus the slow shot that would have been awesome!

90gr smk loaded to 2.29" with Varget two shots only.
23.5gr: 2443,2457=2450 9/14
24.0: 2502,2498=2500 2/4
24.5: 2561,2561=2561 0/0
25.0: 2597,2617=2607 14/20
25.5: 2676,2655=2662 10/15

pressure started to show on 24.5 and was quite heavy at 25.5, my buffer is a standard buffer to I ordered JP's new gen 2 H2 SCS buffer kit. This will likely allow 24.5 to be fired fine and will also stop the slight ejector marks I saw on the factory ammo.

Using my lyman borecam, the barrel is a cut rifled barrel. There was just one slight burr in the area where the lands start and after firing and clean the bore at 20 rounds the burr was gone. This barrel finishes up nicely with a 15" forearm and keeps the gas block just out of sight.

Once my H2 buffer arrives I'll shoot more. Given the velocity with the 90 grain bullets, I'd bet I'll be in the mide to upper 2600's with 80 gr A-Max. Which is what I plan to run in this barrel mostly as it will be my coyote killer.

Goes to show you Rocks are fast!

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#12599 - 03/01/18 01:30 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
It's hard leaving a new toy alone... Went out and tested 80 A-Max before getting the H2 buffer.

Bullet seated at 2.290, Varget powder.
24.0gr = 2557,2551= 2554 4/6
24.5gr = 2589,2624= 2606 24/35
25.0gr = 2686,2691= 2688 3/5

only the 25 grain charge showed slight ejector swipes and I believe these will easily disappear once the H2 arrives.

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#12600 - 03/04/18 06:26 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
Went to the range today. The wind was really blowing. 600 was my limit for the day. Held .4 mils for all 5 shots...

A third of a moa vertical isn't bad. These were 90 gr FGMM.

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#12601 - 03/04/18 09:05 PM Re: .224 Valkyrie [Re: Niles Coyote]
Cinch Offline
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Registered: 07/09/11
Posts: 1277
Loc: Wyoming
Well done that's very decent!

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#12602 - 03/05/18 02:48 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
Velocity test, AR-Comp and 80 Amax seated 2.280

22.7: 2685,2695=2690 7/10
23.2: 2747,2733=2740 9/13

I'll add that to the list to test next time at the range. Thinking of starting at 21.5 and working up. Headstamps looked good.

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#12603 - 03/07/18 02:29 AM Re: .224 Valkyrie [Re: Niles Coyote]
Cinch Offline
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Registered: 07/09/11
Posts: 1277
Loc: Wyoming
Not too shabby! About 223AI velocities?

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#12604 - 03/11/18 08:00 AM Re: .224 Valkyrie [Re: Cinch]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
Originally Posted By: Cinch
Not too shabby! About 223AI velocities?


Agree, I am realy liking this barrel. It is matching (sometimes surpassing) the velocities of my heavy loaded, long throated 223 bolt rifle but in a semi and a 4" shorter barrel.

yesterday's range session

On a different note, I pulled some of my 75 TMJ bullets from Federal AE and replaced them with 75 grain Amax at different lengths and this was the result.


I had some trigger difficulties that I attribute some of the horizontal spread too. My trigger was gunked up and the 34 degrees didn't help matters. This was causing the trigger to be very inconsistent with where the sear would brake. It's been cleaned and lubed now and back to its old self so I will retest 2.300-2.280. Also of note, with the longer seating depths I had less ejector prints on my case heads

Even with the trigger issues I noted above it appears there is a node at or very near 22.8 & 23.2 grain of AC-Comp using 80 A-max. This powder was not able to reliably feed using my JP SCS H2 gen 2 buffer/spring combo, it would only push the BCG back enough to eject. Brass case heads were nice and clean, no ejector marks present. I'll try 22.8 & 23.2-23.4 again with my standard weight JP SCS. All groups were 5 shots, I had a couple one holers.


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#12605 - 03/12/18 02:16 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
Found Reloder 15 at the LGS, 90 gr smk loaded to 2.3" powered by 25.2 grains.

Group testing in a few days.

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#12606 - 03/13/18 02:40 PM Re: .224 Valkyrie [Re: Niles Coyote]
Niles Coyote Online   content
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Registered: 07/09/11
Posts: 1411
Loc: S.W. Michigan
Given the press fit method used, these measurements are likely +.020" into the lands of my 18" Rock Creek barrel. I have no idea what the reamer spec's were so your barrel is likely different.I am using a dial caliper so take 1" off the ogive measurement.

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